Stephen Boulet <stepheb at comm_mot.com> asks: > > Can a needle valve be used in front of a sintered glass diffuser like Eheim's? Yes. It will provide a flow restriction in case the diffuser breaks or pops off. You can decide for yourself if it *should* be used. (IMO, redundancy is good). Regards, Bob "If we don't succeed, we run the risk of failure." -- Dan Quayle